NAME
Unicode::EastAsianWidth - East Asian Width properties
SYNOPSIS
use Unicode::EastAsianWidth;
$_ = chr(0x2010); # HYPHEN, an ambiguous-width character
/\p{InEastAsianAmbiguous}/; # True
/\p{InFullwidth}/; # False
To mark ambiguous-width characters as InFullwidth:
BEGIN { $Unicode::EastAsianWidth::EastAsian = 1; }
use Unicode::EastAsianWidth;
$_ = chr(0x2010); # HYPHEN, an ambiguous-width character
/\p{InFullwidth}/; # True
DESCRIPTION
This module provide user-defined Unicode properties that deal with width
status of East Asian characters, as specified in
.
It exports the following functions to the caller's scope, to be used by
Perl's Unicode matching system: "InEastAsianFullwidth",
"InEastAsianHalfwidth", "InEastAsianAmbiguous", "InEastAsianNarrow"
"InEastAsianWide", "InEastAsianNeutral".
In accord to TR11 cited above, two additional context-sensitive
properties are exported: "InFullwidth" (union of "Fullwidth" and "Wide")
and "InHalfwidth" (union of "Halfwidth", "Narrow" and "Neutral").
*Ambiguous* characters are treated by default as part of "InHalfwidth",
but you can modify this behaviour by assigning a true value to
$Unicode::EastAsianWidth::EastAsian at compile time within a "BEGIN"
block before loading this module:
BEGIN { $Unicode::EastAsianWidth::EastAsian = 1; }
use Unicode::EastAsianWidth;
Setting $Unicode::EastAsianWidth::EastAsian at run-time used to work on
Perl versions between 5.8 and 5.14 due to an implementation detail, but
it will no longer work on Perl 5.16 and later versions, and hence is not
recommended.
SEE ALSO
perlunicode,
AUTHORS
唐鳳
CC0 1.0 Universal
To the extent possible under law, 唐鳳 has waived all copyright and
related or neighboring rights to Unicode-EastAsianWidth.
This work is published from Taiwan.